System and method for surface-mounted permanent magnet motor control using peak torque

An electronic controller comprising:

• a processor;
• and
• a memory that includes instructions that, when executed by the processor, cause the processor to:
• determine, a peak torque value;
• determine a limited torque command based on a torque command and which does not exceed the peak torque value;
• determine, based on the limited torque command, a current command;
• and
• command, based on the current command, an inverter to apply an output voltage to a surface-mounted permanent magnet (SPM) motor,
• wherein determining the peak torque value includes:
• determining a voltage angle of the output voltage relative to a q-axis;
• and
• calculating the peak torque value based on the voltage angle of the output voltage and based on an available voltage to an input of the inverter.

A motor control system, comprising:

• a surface-mounted permanent magnet (SPM) motor;
• an inverter configured to supply an alternating current (AC) power to the SPM motor;
• and
• a controller configured to:
• determine, a peak torque value;
• determine a limited torque command based on a torque command and which does not exceed the peak torque value;
• determine, based on the limited torque command, a current command;
• and
• command, based on the current command, the inverter to apply an output voltage to the SPM motor,
• wherein determining the peak torque value includes:
• determining a voltage angle of the output voltage relative to a q-axis;
• and
• calculating the peak torque value based on the voltage angle of the output voltage and based on an available voltage to an input of the inverter.